JP2013227937A - Electric blower and electric vacuum cleaner using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric blower with improved blowing performance.SOLUTION: An electric blower includes: an electric motor 2 having a rotor 15, a diffuser 5 disposed on an outer periphery of an impeller 4 provided at the end of a shaft 3 of the rotor 15, and a casing 7 covering the impeller 4 and the diffuser 5. The diffuser 5 includes: a stationary blade 18 disposed on the casing 7 side and constituted of a plurality of blades 18a recovering pressure of wind discharged from the impeller 4; a disk-like base 19 disposed in contact with one end of the stationary blade 18; and a return blade 20 constituted of a plurality of blades 20a disposed on a face of the base 19 facing the electric motor 2. The stationary blade 18 and the casing 7 are integrated, and the stationary blade 18 is made of a material higher in physical strength than the return blade 20. No gap is formed between the casing 7 and the stationary blade 18, and a deformation amount of the blades 18a is small even if the blades 18a are brought into pressure-contact with the base 19, thereby preventing degradation in suction performance.

Description

  The present invention relates to an electric blower used for a vacuum cleaner and the like and a vacuum cleaner using the same.

  As conventional electric blowers for general vacuum cleaners, there are those shown in FIGS. 5 and 6 (see, for example, Patent Document 1). FIG. 5 is a half sectional view of a conventional electric blower described in Patent Document 1, and FIG. 6 is an exploded perspective view of the electric blower (with a casing removed).

  As shown in FIGS. 5 and 6, the conventional electric blower 1 includes an electric motor 2, an impeller 4 having a plurality of blades 4 a provided at one end of a shaft 3 that is an output shaft of the electric motor 2, and an outer periphery of the impeller 4. A diffuser portion 5 that rectifies the wind discharged from the impeller 4 and that covers the impeller 4 and the diffuser portion 5, has an air inlet 6 in the center, and is constituted by a casing 7 mainly made of sheet metal.

  The electric motor 2 includes a stator 10 in which a stator core 9 is provided on a stator core 8, a rotor core 12 provided on a rotor core 11 provided on the shaft 3, and a commutator 13 disposed coaxially at both ends of the shaft 3. A rotor 15 is rotatably fixed by a provided bearing 14 and a carbon brush 16 is energized to the commutator 13 of the rotor 15.

  The rotor 15 is fixed to the bracket 17 via the bearing 14, and the stator 10 is fixed to the inner surface of the bracket 17 so as to cover the rotor 15. The casing 7 is press-fitted and held at one end of the bracket 17 so as to cover the impeller 4 and the diffuser portion 5.

  The diffuser unit 5 includes a stationary blade unit 18 including a plurality of blades 18a that form a passage that gradually increases the cross-sectional area of the flow path in order to gradually decelerate the wind discharged from the impeller 4 and recover pressure. A base 19, which is located on the motor 2 side of the wing 18 and is configured in a substantially disk shape, and a return composed of a plurality of blades 20 a, which are located on the motor 2 side of the base 19, for smoothly guiding the wind into the motor 2. It is comprised with the wing | blade part 20, These are mainly made from resin, and are the integral structure.

  The operation and action of the conventional electric blower configured as described above will be described below.

  When the conventional electric blower 1 is operated, the electric motor 2 is energized from the carbon brush 16 to the rotor winding 12 through the commutator 13. Then, the rotational position of the rotor 15 is moved by the action of the magnetic field generated by the stator winding 9 and the magnetic field of the rotor winding 12. Even if the rotational position of the rotor 15 is moved, the commutator 13 and the carbon brush 16 are always in contact with each other, so that energization to the rotor winding 12 is continued and the rotation of the rotor 15 is continued. The electric motor 2 operates.

  In conjunction with this operation, rotation of the impeller 4 coupled to the shaft 3 causes the inside of the impeller 4 to become a negative pressure with respect to the external air pressure and sucks the wind. The sucked air enters the electric blower 1 from the intake port 6 of the casing 7, is discharged radially by the impeller 4, and is gradually decelerated by the stationary blade portion 18 of the diffuser portion 5 to convert the dynamic pressure to static pressure. Thus, the pressure is restored, the flow is changed from the outer peripheral direction to the inner peripheral direction in the vicinity of the outer peripheral side wall surface of the casing 7, and is smoothly guided into the bracket 17 of the electric motor 2 by the return wing portion 20. After cooling with the sucked air, it is finally discharged out of the electric blower 1.

JP 2006-132369 A

  Conventionally, in order to improve the suction performance, it is common to press contact so that there is no gap between the casing 7 side tip of the vane 18a of the stationary blade portion 18 and the casing 7 (if there is a gap, An enlarged passage having a flow passage area constituted by the wing portion 18 is partially enlarged, and pressure recovery is reduced).

  However, in the configuration of the conventional electric blower as described in the above-mentioned Patent Document 1, if variations occur in the manufacturing surface, such as the flatness of the casing 7 or the height of the blades 18a of the stationary blade portion 18, first contact is made. The vane 18a of the stationary vane portion 18 that has been bent is bent and deformed such as crushing, and the area balance of the flow path expansion passage formed by the stationary vane portion 18 is lost, causing a problem in that the suction performance is reduced.

  In particular, for the combination in which the surface shape such as the casing 7 is sheet metal and the rib shape such as the blade 18a of the stationary blade portion 18 is made of resin, the rib side is inferior in physical strength to the surface side. The tendency becomes stronger.

  This invention solves the said conventional subject, and it aims at providing the vacuum cleaner excellent in the suction performance while improving the suction performance of an electric blower.

  In order to solve the conventional problems, an electric blower of the present invention includes an electric motor having a rotor and a stator, a bracket for housing the electric motor, an impeller provided at an end of a shaft of the rotor, and the impeller. A diffuser portion disposed on an outer periphery of the casing, and a casing that covers the impeller and the diffuser portion and is held by an end portion of the bracket, and the diffuser portion is located on the casing side and discharged from the impeller. A plurality of blades provided on a surface of the base on the electric motor side of the base, a disk-shaped base disposed so as to be in contact with one end of the base blade, The stationary blade portion and the casing are integrated with each other, and the stationary blade portion is formed with respect to the returning blade portion. Consists of materials with strong physical properties, no gaps occur between the casing and the stationary blade part, and the blades of the stationary blade part are physically stronger than the foundation, so even if the blade and the foundation are in pressure contact Since the deformation amount of the blades is reduced and the area balance of the flow passage expanding passage of the stationary blade portion is not easily lost, it is possible to prevent the suction performance from being lowered, that is, to improve the suction performance.

  Moreover, the vacuum cleaner of this invention uses the electric blower of any one of Claims 1-4, and can implement | achieve a vacuum cleaner with high suction performance.

  The electric blower of the present invention has high suction performance, and an electric vacuum cleaner having excellent suction performance can be provided by using this electric blower for a vacuum cleaner.

Half sectional view of electric blower in Embodiment 1 of the present invention The partial expanded sectional view of the electric blower in Embodiment 2 of this invention Partial enlarged sectional view showing another example of the electric blower The block diagram of the vacuum cleaner in Embodiment 3 of this invention Half sectional view of a conventional electric blower The exploded perspective view of the electric blower with the casing removed

  The first invention includes an electric motor having a rotor and a stator, a bracket for housing the electric motor, an impeller provided at an end of a shaft of the rotor, a diffuser portion disposed on an outer periphery of the impeller, A plurality of blades that cover an impeller and a casing that covers the diffuser portion and is held at an end of the bracket, the diffuser portion being located on the casing side and recovering the pressure of the air discharged from the impeller A stationary blade portion formed of: a disk-shaped base disposed so as to contact one end of the stationary blade portion; and a return blade portion formed by a plurality of blades provided on the motor-side surface of the base. The stationary blade portion and the casing are integrated, and the stationary blade portion is made of a material having a strong physical property with respect to the return blade portion. There is no gap between the single blade and the vane, and the vane of the vane part is physically stronger than the base, so even if the vane and the base are in pressure contact, the amount of deformation of the vane decreases, and the vane Since the area balance of the flow path expanding passages of the part is not easily lost, the suction performance can be prevented from being lowered, that is, the suction performance can be improved.

  In the second invention, in particular, a recess in which an end of a blade of the stationary blade portion is fitted is provided on a base surface of the return blade portion that contacts the stationary blade portion of the first invention, and the stationary blade portion And the return wing portion are fitted to each other, so that a gap at the joint portion between the stationary blade portion and the base is less likely to be generated, and the suction performance can be further improved.

  In particular, the third invention provides the stationary blade portion integrally formed with the casing by providing a through-hole extending from the end of the blade of the stationary blade portion of the first or second invention on the motor side to the outer surface of the casing. After assembling the return wing part, the adhesive is poured from the through hole, and the vane of the stationary blade part and the return wing part are joined, and a gap is formed at the joint between the stationary blade part and the base. This makes it difficult to improve the suction performance.

  In the fourth invention, in particular, the through-hole of the third invention is arranged on the upstream side of the vanes of the stationary blade portion, and the base of the return blade portion is inclined toward the motor side from the upstream side to the downstream side. Since the adhesive easily flows from the leading end side to the trailing end side of the vanes of the stationary blade portion, it becomes more difficult to form a gap at the joint portion between the stationary blade portion and the base, further improving the suction performance. be able to.

  A vacuum cleaner according to a fifth aspect of the present invention uses the electric blower according to any one of claims 1 to 4, and can realize a vacuum cleaner with high suction performance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a half cross-sectional view of an electric blower according to Embodiment 1 of the present invention. In addition, about the same component as the said conventional electric blower, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 1, an electric blower 1 according to the present embodiment includes an electric motor 2, an impeller 4 provided at one end of a shaft 3 that is an output shaft of the electric motor 2, a plurality of blades 4 a, and an impeller positioned on the outer periphery of the impeller 4. 4, a diffuser portion 5 that rectifies the air discharged from the air, and a casing 7 that covers the impeller 4 and the diffuser portion 5 and has an intake port 6 in the center.

  The electric motor 2 includes a stator 10 in which a stator core 9 is provided on a stator core 8, a rotor core 12 provided on a rotor core 11 provided on the shaft 3, and a commutator 13 disposed coaxially at both ends of the shaft 3. A rotor 15 is rotatably fixed by a provided bearing 14 and a carbon brush 16 is energized to the commutator 13 of the rotor 15.

  The rotor 15 is fixed to the bracket 17 via the bearing 14, and the stator 10 is fixed to the inner surface of the bracket 17 so as to cover the rotor 15. The casing 7 is press-fitted and held at one end of the bracket 17 so as to cover the impeller 4 and the diffuser portion 5.

  The diffuser unit 5 includes a stationary blade unit 18 including a plurality of blades 18a that form a passage that gradually increases the cross-sectional area of the flow path in order to gradually decelerate the wind discharged from the impeller 4 and recover pressure. A base 19, which is located on the motor 2 side of the wing 18 and is configured in a substantially disk shape, and a return composed of a plurality of blades 20 a, which are located on the motor 2 side of the base 19, for smoothly guiding the wind into the motor 2. The stationary blade portion 18 is integrally formed with the casing 7, the base 19 and the return blade portion 20 are integrally formed, and is integrally formed with the casing 7. The material strength of the material forming the stationary blade portion 18 is stronger than the base 19 and the return blade portion 20 (for example, the integral part of the casing 7 and the stationary blade portion 18 is mainly made of magnesium. Made of alloy Goods, integral part of the blade portion 20 returns a foundation 19, a molded article made of a general resin material such as nylon).

  When the electric blower 1 according to the present embodiment configured as described above is operated, the electric motor 2 is energized from the carbon brush 16 to the rotor winding 12 through the commutator 13. Then, the rotational position of the rotor 15 is moved by the action of the magnetic field generated by the stator winding 9 and the magnetic field of the rotor winding 12. Even if the rotational position of the rotor 15 is moved, the commutator 13 and the carbon brush 16 are always in contact with each other, so that energization to the rotor winding 12 is continued and the rotation of the rotor 15 is continued. The electric motor 2 operates.

  In conjunction with this operation, rotation of the impeller 4 coupled to the shaft 3 causes the inside of the impeller 4 to become a negative pressure with respect to the external air pressure and sucks the wind.

  The sucked wind enters the electric blower 1 from the intake port 6 of the casing 7, is discharged radially by the impeller 4, and is gradually decelerated by the stationary blade portion 18 of the diffuser portion 5, thereby making the dynamic pressure static. The pressure is recovered by the conversion, the flow is changed from the outer peripheral direction to the inner peripheral direction in the vicinity of the outer peripheral side wall surface of the casing 7, and is smoothly guided to the inside of the bracket 17 of the electric motor 2 by the return wing portion 20. After cooling with the wind sucked by itself, it is finally discharged out of the electric blower 1.

  At that time, in the electric blower 1 in the present embodiment, the stationary blade portion 18 is integrated with the casing 7, the return blade portion 20 is integrated with the base 19, and the physical strength of the stationary blade portion 18 is By being strong against the base 19, no gap is generated between the casing 7 and the stationary blade portion 18, and the blade 18 a of the stationary blade portion 18 is physically stronger than the base 19. Is reduced, the amount of deformation of the blade 18a is reduced, and the area balance of the flow passage expansion passage of the stationary blade portion 18 is less likely to be lost, so that the suction performance is prevented from being lowered, that is, the suction performance is improved. it can.

(Embodiment 2)
FIG. 2 is a partially enlarged cross-sectional view of the electric blower according to Embodiment 2 of the present invention. In addition, about the same component as the electric blower in the said Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 2, the electric blower in the present embodiment is provided with a concave portion 21 in which the end of the blade 18 a of the stationary blade portion 18 is fitted on the surface of the base 19 that contacts the blade 18 a of the stationary blade portion 18. Thus, the blade 18a of the stationary blade portion 18 and the base 19 are fitted together.

  Since the electric blower in the present embodiment is configured as described above, a gap at the joint between the stationary blade portion 18 and the base 19 is less likely to be generated, and the suction performance can be further improved.

  Further, as shown in FIG. 3, a through-hole 22 extending from the end of the blade 18 a of the stationary blade portion 18 on the bracket 17 side to the outer surface of the casing 7 is provided, and the stationary blade portion 18 integrally formed with the casing 7 After assembling the base 19, an adhesive (not shown) is poured from the through hole 22 to join the blades 18 a of the stationary blade portion 18 and the base 19, and further, the stationary blade portion 18 and the base 19 are joined. It becomes difficult to produce a gap at the joint portion with the nozzle, and the suction performance can be improved.

  Although not particularly illustrated, the through hole 22 is disposed upstream (on the impeller 4 side) of the vane 18a of the stationary blade portion 18, and the base 19 of the return blade portion 20 is disposed downstream (reverse) from the upstream (impeller 4 side). By inclining toward the bracket 17 side toward the impeller 4 side, the adhesive can easily flow from the tip (impeller 4 side) to the rear end (counter impeller 4 side) of the blade 18a of the stationary blade portion 18, and the stationary blade Since it becomes difficult to produce the clearance gap in the junction part of the part 18 and the base 19, suction performance can be improved further.

(Embodiment 3)
FIG. 4 is a configuration diagram of the electric vacuum cleaner according to Embodiment 3 of the present invention. In addition, about the same component as the electric blower in the said embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 4, the electric vacuum cleaner in the present embodiment includes a vacuum cleaner body 34, a hose 35 that communicates with the vacuum cleaner body 34, an extension pipe 36 that communicates with one end of the hose 35, and an extension pipe 36. An operation handle 37 provided at the end and a floor suction tool 38 communicating with one end of the extension pipe 36 are provided, and the electric blower 1 for generating a suction force is built in the cleaner body 34. 1 has a dust collection chamber 39 for storing sucked dust. The electric blower 1 uses the electric blower 1 shown in the first or second embodiment.

  The operation of the vacuum cleaner in the present embodiment configured as described above will be described. When the user starts the operation of the vacuum cleaner with the operation handle 37, the electric blower 1 generates a suction force, Dust is sucked together with air from the floor suction tool 38 that moves the floor surface. The sucked dust flows together with air to the dust collecting chamber 39 through the extension pipe 36 and the hose 35, and the dust and air are separated in the dust collecting chamber 39, and the dust is stored in the dust collecting chamber 39. 1 sucks.

  The air sucked by the electric blower 1 passes through the electric blower 1, passes through the cleaner main body 34, and is discharged outside the cleaner main body 34.

  At this time, since the vibration of the electric blower 1 is reduced, the noise when arranged in the vacuum cleaner is low, and comfortable cleaning can be performed.

  As described above, since the electric blower according to the present invention and the vacuum cleaner using the electric blower can reduce the noise of the electric blower, the electric blower can be widely applied to household electric appliances and industrial equipment using the electric blower. .

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Electric motor 3 Shaft 4 Impeller 4a, 18a, 20a Blade 5 Diffuser part 6 Air inlet 7 Casing 8 Stator core 9 Stator winding 10 Stator 11 Rotor core 12 Rotor winding 13 Commutator 14 Bearing 15 Rotor 16 Carbon brush 17 Bracket 18 Static vane part 19 Base 20 Return wing part 21 Concave part 22 Through-hole 34 Vacuum cleaner body 35 Hose 36 Extension pipe 37 Operation handle 38 Floor suction tool 39 Dust collection chamber

Claims (5)

An electric motor having a rotor and a stator; a bracket for housing the electric motor; an impeller provided at an end of a shaft of the rotor; a diffuser portion disposed on an outer periphery of the impeller; the impeller and the diffuser portion; A stationary blade portion including a plurality of blades that cover the casing and is held at an end portion of the bracket, and the diffuser portion is located on the casing side and recovers the pressure of the air discharged from the impeller. A disk-shaped base disposed so as to be in contact with one end of the stationary blade part, and a return blade part formed by a plurality of blades provided on a surface of the base on the motor side. An electric blower in which a wing portion and the casing are integrally configured, and the stationary blade portion is made of a material having a strong physical strength with respect to the return wing portion. The base surface of the return wing part in contact with the stationary wing part is provided with a recess in which an end of a blade of the stationary wing part is fitted, and the stationary wing part and the return wing part are fitted. The electric blower according to 1. A through hole is provided from the end of the vane of the stationary blade portion on the motor side to the outer surface of the casing, and after assembling the stationary blade portion and the return blade portion integrated with the casing, an adhesive is applied from the through hole. The electric blower according to claim 1, wherein the electric blower is poured and the blades of the stationary blade portion and the return blade portion are joined. The electric blower according to claim 3, wherein the through hole is arranged on the upstream side of the vanes of the stationary blade portion, and the base of the return blade portion is inclined toward the electric motor side from the upstream side toward the downstream side. The vacuum cleaner using the electric blower of any one of Claims 1-4.